bpo-46417: Use _PyType_CAST() in Python directory (GH-30769)

Author: vstinner

Python/bltinmodule.c

@@ -536,7 +536,7 @@ static PyObject *
 filter_vectorcall(PyObject *type, PyObject * const*args,
                 size_t nargsf, PyObject *kwnames)
 {
-    PyTypeObject *tp = (PyTypeObject *)type;
+    PyTypeObject *tp = _PyType_CAST(type);
     if (tp == &PyFilter_Type && !_PyArg_NoKwnames("filter", kwnames)) {
         return NULL;
     }
@@ -1251,7 +1251,7 @@ static PyObject *
 map_vectorcall(PyObject *type, PyObject * const*args,
                 size_t nargsf, PyObject *kwnames)
 {
-    PyTypeObject *tp = (PyTypeObject *)type;
+    PyTypeObject *tp = _PyType_CAST(type);
     if (tp == &PyMap_Type && !_PyArg_NoKwnames("map", kwnames)) {
         return NULL;
     }

Python/specialize.c

@@ -1339,8 +1339,7 @@ specialize_class_call(
     PyObject *callable, _Py_CODEUNIT *instr,
     int nargs, SpecializedCacheEntry *cache)
 {
-    assert(PyType_Check(callable));
-    PyTypeObject *tp = (PyTypeObject *)callable;
+    PyTypeObject *tp = _PyType_CAST(callable);
     if (_Py_OPCODE(instr[-1]) == PRECALL_METHOD) {
         SPECIALIZATION_FAIL(CALL_NO_KW, SPEC_FAIL_METHOD_CALL_CLASS);
         return -1;